I have the Gplus oil cooler kit inc thermostat fitted on my s15. Had no problems with it over the last 6 months and the oil temps sit around 80° in summer during daily driving. I have yet to take it to the track and test its full capabilities though.

I'd personally look for a similar Chinese kit that's designed as an oil relocation with integrated thermostat, same concept as the Gplus oil cooler kit but not a spin-on version, then get one of TAARKS bolt on relocation blocks. Considering how many threads have been raised in the past on Nissan forums regarding snapped oil filter mount tubes (the threaded tube you screw the filter onto) due to the load of spin-on adapters, I'm not sure that I'd be keen to have that on a race car.

The worst that's likely to happen with a bolt-on relocation block is a minor leak, as there's nothing under load that could shear off. If the filter thread snaps, you could quickly dump a lot of oil on the track, which could have dire consequences for you and everyone else travelling at speed around bends.

Good idea mate. I will admit with the new sump, GKTECH fan, shroud and new radiator I had absolutely no heating issues. I think it was more towards the end of each session the oil was heating up and had a minor drop in oil pressure but nothing to worry about.

I've used only china coolers on my cars for year and these are by far the best quality. I don't even think you can get the blue painted ones anymore. I've had one of the old blue ones you could get almost explode on me when i didn't set my dry sump pump pressure correctly and it saw over 100psi briefly. It basically ballooned out of shape. Entirely my fault though. A thermostat is a waste of time. Been there done that. i have one sitting in a box because i doubt I'll ever use it again.